A text book on fish biology covering up-to-date informations has been felt since long. Fundamentals of Ichthyology is an endeavour to bring out a comprehensive information on all important aspects of fish biology and ecology. The book contains 18 chapters. The first 12 chapters are devoted to the basic biology of fishes such as morphology, food and feeding, circulation, respiration, excretion, osmoregulation, locomotion, reproduction and internal integration. The next 5 chapters deal with ethology and genetics, population studies, diseases, preservation and processing and ecology of the fish habitat. The common methods used in fish biology studies are incorporated in chapter 18. The technical terms used in fishery biology are dealt with in the Glossary section of the book. In the text, descriptions are supported by suitable examples and figures to make them easily understandable.